I'm not sure, but maybe it is. :)

ダナンで海水浴を楽しむなら、5～7月が良いと思います。2月は雨期の終わりの方で、あまり暑くなく過ごしやすいかもしれません。ダナンは北にフエ、南にホイアンという世界遺産の街があり、観光するにはよいところです。ホイアンは九分に似ている街ですよ。 また、Ba Na Hillsといって、USJのようなテーマパークもあります。 海水浴だけでなく、世界遺産、海、博物館、遺跡など、様々なものが楽しめる観光地です。 私も今年2回行きましたが、来年も行こうと思っています。

If you want to be in a beach town, stay in Danang. You can always take daytrips to Hoi An, which is only 29km away. Hoi An also has a few nice beaches about 5km away, An Bang (very touristy), Lonely beach (very nice and cheaper), and Coconut beach (you will have the whole beach to yourself). Are you travelling with kids? We rented scooters for the week, and travelled between the 2 towns (we stayed in both). The distance between Danang and Hue is about 100km one way. So put a whole day aside if you are not sleeping over in Hue. (you are obviously going to stop along the way to take in the scenery and take pictures). Also Hai Van Pass has lots of twists and turns, if you are travelling by scooter and are not an experienced motorcycle driver, beware of trucks, etc. But still worth it, very beautiful. I have a contact in Danang for renting scooters. Just message me.

The weather is still pretty good. A little cooler, maybe 20-25C, but when it's sunny it's great for a swim. Be ready for cool water though!

Yes parasailing, jet ski, banana boat

We used Adventure Travels Vietnam. They are reliable and picked us up on time.

As far as I am aware, the 'no swimming zones' are more prevalent at this time of year due to weather conditions, which result in large amounts of debris and more importantly, 'under tows' or 'rip currents' and I certainly noticed the latter off My Khe beach on my visit in September. The tides also create 'hidden gullies' which can suddenly put you out of your depth. Hopefully the areas will become less prevalent as the seasons change, but in the meantime, rely on the lifeguards.